docs: def occupy(self, start, stop):
          """
              Mark a given interval as occupied so that the manager could skip
              the values from ``start`` to ``stop`` (**inclusive**).
  
              :param start: beginning of the interval.
              :param stop: end of the interval.
  
              :type start: int
              :type stop: int
          """
  
          self._occupied.append([start, stop])
          self._occupied.sort(key=lambda x: x[0])